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ATACONTROL(8)           FreeBSD System Manager's Manual          ATACONTROL(8)

     atacontrol -- ATA device driver control program

     atacontrol <command> args

     atacontrol attach channel
     atacontrol detach channel
     atacontrol reinit channel
     atacontrol create type [interleave] disk0 ... diskN
     atacontrol delete raid
     atacontrol addspare raid disk
     atacontrol rebuild raid
     atacontrol status raid
     atacontrol mode device
     atacontrol info channel
     atacontrol cap device
     atacontrol list

     The atacontrol utility is a control program that provides the user access
     and control to the FreeBSD ata(4) subsystem.

     The atacontrol utility can cause severe system crashes and loss of data
     if used improperly.  Please exercise caution when using this command!

     The channel argument is the ATA channel device (e.g., ata0) on which to
     operate.  The following commands are supported:

     attach   Attach an ATA channel.  Devices on the channel are probed and
              attached as is done on boot.

     detach   Detach an ATA channel.  Devices on the channel are removed from
              the kernel, and all outstanding transfers etc. are returned back
              to the system marked as failed.

     reinit   Reinitialize an ATA channel.  Both devices on the channel are
              reset and initialized to the parameters the ATA driver has
              stored internally.  Devices that have gone bad and no longer
              respond to the probe, or devices that have physically been
              removed, are removed from the kernel.  Likewise are devices that
              show up during a reset, probed and attached.

     create   Create a type ATA RAID.  The type can be RAID0 (stripe), RAID1
              (mirror), RAID0+1, SPAN or JBOD.  In case the RAID has a RAID0
              component, the interleave must be specified in number of sec-
              tors.  The RAID will be created of the individual disks named
              disk0 ... diskN.

              Although the ATA driver allows for creating an ATA RAID on disks
              with any controller, there are restrictions.  It is only possi-
              ble to boot on an array if it is either located on a ``real''
              ATA RAID controller like the Promise or Highpoint controllers,
              or if the RAID declared is of RAID1 or SPAN type; in case of a
              SPAN, the partition to boot must reside on the first disk in the

     delete   Delete a RAID array on a RAID capable ATA controller.

              Add a spare disk to an existing RAID.

     rebuild  Rebuild a RAID1 array on a RAID capable ATA controller.

     status   Get the status of an ATA RAID.

     mode     Without the mode argument, the current transfer modes of the
              device are printed.  If the mode argument is given, the ATA
              driver is asked to change the transfer mode to the one given.
              The ATA driver will reject modes that are not supported by the
              hardware.  Modes are given like ``PIO3'', ``udma2'',
              ``udma100'', case does not matter.

              Currently supported modes are: PIO0, PIO1, PIO2, PIO3, PIO4,
              WDMA2, UDMA2 (alias UDMA33), UDMA4 (alias UDMA66), UDMA5 (alias
              UDMA100) and UDMA6 (alias UDMA133).  The device name and manu-
              facture/version strings are shown.

     cap      Show detailed info about the device on device.

     info     Show info about the attached devices on the channel.

     list     Show info about all attached devices on all active controllers.

     To get information on devices attached to a channel, use the command

           atacontrol info ata0

     To see the devices' current access modes, use the command line:

           atacontrol mode ad0

     which results in the modes of the devices being displayed as a string
     like this:

           current mode = UDMA100

     You can set the mode with atacontrol and a string like the above, for

           atacontrol mode ad0 PIO4

     The new modes are set as soon as the atacontrol command returns.


     The atacontrol utility first appeared in FreeBSD 4.6.

     The atacontrol utility was written by Soren Schmidt <>.

     This manual page was written by Soren Schmidt <>.

FreeBSD 6.2                     August 16, 2005                    FreeBSD 6.2


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